The only way I have figured out how to get the USPS method to show at all is, as other posters have mentioned, to have no shipping methods enabled at all. So I cannot enable free shipping as a method because then I can’t get the shipping caluclator to show. The documentation mentions that this plugin does not support zones. I don’t know any other way to get it to show except for having no shipping methods enabled for my zone.
What should I be doing instead, in order to have the USPS shipping method and free shipping method enabled for my shipping zone? thanks.